Here is the full list of all 46 Detective From The Crypt achievements.
Help a kind mummy
Listen the audio record
Find all the pearls
Open all safes
Open the governess version
Open the version with Lord Darkday
Open Lady Darkday version
Open version with Aunt Esther
Return the necklace to its owner
Learn the secret of the automaton
Find the use of soap bubbles
Unlock all versions of events
Scare the butler to death
Help the cat mummy
Find grandfather's diary
Discover the secret of the library
Put the poison into hot chocolate
Make Aunt Drink
Get sleeping pills from the doctor
Find the pocket mirror
Get the second letter
Find the poacher
Open the Butler version
Find the use of the dung-beetle
Help Mrs Brown
Find the rat
Help Mrs. Jones
Find Anubis Mask
Open the Sarcophagus
Find Pulcheria
Find a use of the figurine
Find the diary
Find out whose button it is
Find Opals
Test Substances for Poison
Take a blood test
Help the loser
Help the Maid
Find the shackles
Apply magnifier to boots
Apply the magnifying glass on the monument
Help the bagpiper
Get a letter from your great-grandmother
Find a pocket watch
Meet the Greedy Bride
Find family jewels